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Diffusion of HTO, sodium 22 and Caesium in Opalinus clay: a combined field, laboratory and modelling study


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Titre du congrès :Clays in natural and engineered barriers for radioactive waste confinement Ville du congrès :Tours Date du congrès :14/03/2005

Type de document > *Congrès/colloque

Mots clés >

Unité de recherche > IRSN/DEI/SARG/LETS

Auteurs > BAEYENS B., CARTALADE A., DEWONCK S., EIKENBERG J., GIMMI Thomas, GROLIMUND D., HERNAN P., SAVOYE Sébastien, SOLER J., VAN DORP F., VAN LOON L., WERSIN Paul, YLLERA A.

Date de publication > 25/04/2005

Résumé

As indicated by recent investigations, diffusion is the main transport process in consolidated argillaceous formations (e.g. Callovo-Oxfordian, Opalinus Clay) that are foreseen as potential host rocks for high-level radioactive waste repositories. However, reliable data on diffusion properties of these rocks are still scarce, in particular with regard to the behaviour of reactive species. This contribution reports on a comprehensive, internationally supported study, which focussed on the diffusion of non-reactive and reactive species in Opalinus Clay, using a combined field, laboratory and modelling approach. The core part involved the investigation of HTO, stable I-, 22Na+ and stable Cs+ diffusion in an in-situ experiment at the Mont Terri Rock Laboratory in Switzerland. The modelling part was largely aided by diffusion data carried out under laboratory conditions